I have a 2006 SS super charged with chevy stage 2 kit. I was driving up a long 7% grade highway hill the other day in 5th gear going about 80 so I was running about 3000ish rpms. All of a sudden I had to floor the car to keep the speed up (which i have never had to do up this hill) and then the car started jerking like I was messing up the manual or like it was misfiring. Has anyone had this issue before. The repair shop wants to start out by changing the spark plugs, any ideas?

 

Spark plugs might help. What you should have done is downshifted to 4th. Never go full throttle in 5th unless your doing like 110+. It puts a ton of strain on the car. Personally I wouldn't do anything unless it start acting up all the time.

 

yes never go WOT In 5th, it puts way too much strain on the transmission. Downshift to 4th.

 

Also you'd know if your car was actually misfiring if the check engine light was flashing.

 

Ok Thanks! The check engine light never came on, I was just describing what it felt like...

 

Also I did down shift to 4th and the car continued to do the same thing

 

Just because there is no light doesn't mean it's not misfiring. Start with plugs, try swapping out the coils, Maybe the cat is clogging up...

 

Have you checked your intercooler pump lately?

 

Putting that much strain on it probably got coolant temps and IAT2's up fairly high which would be my guess of what caused your problem.

 

I had the spark plugs replaced. The problem still exists I have also found it only occurs when you stomp the gas or going up a hill, but it doesn't matter how hot the engine is. It will still happen even if the I have just started the car.

 

Are the RPMs changing when it jerks like this? How many miles on the car? and have you ever replaced the clutch?

 

the rpms do not change. Just kind of a lack of power. I have never changed the clutch and it has 64k miles

 

Does it happen in every gear? And what is your boost gauge reading when you put the pedal to the floor?

 

I was gonna guess your clutch was slipping and grabbing but if the rpms aren't jumping that's not it. Have you checked to see if your intercooler pump is still working? It's common for those to fail on the supercharged ss

 

Even without a CEL get your codes scanned.

 

It happens every gear except first. At the time I noticed the supercharger read like 13-14 which seems pretty high for normal driving. I had them scan it for codes and only one showed up which was "P0171 fuel trim system to lean bank 1." Thanks for all the suggestions! Unfortunately I can't have the car looked at agin till Monday so I am hoping it will get resolved then, but hopefully all the ideas will help narrow it down.

 

Well if boost is normal and you are getting the p0171 code, then I'd almost bet you are getting knock retard and that's making the car feel sluggish because it's pulling timing. You might have a leak in your air intake somewhere after the MAF causing it to run lean